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Subject[patch 2/2] introduce vdso on s390
From: Martin Schwidefsky <schwidefsky@de.ibm.com>

Add a vdso to speed up gettimeofday and clock_getres/clock_gettime for
CLOCK_REALTIME/CLOCK_MONOTONIC.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
---

arch/s390/Kconfig | 3
arch/s390/include/asm/auxvec.h | 2
arch/s390/include/asm/elf.h | 16 ++
arch/s390/include/asm/mmu.h | 1
arch/s390/include/asm/page.h | 2
arch/s390/include/asm/vdso.h | 39 +++++
arch/s390/kernel/Makefile | 9 -
arch/s390/kernel/asm-offsets.c | 15 ++
arch/s390/kernel/time.c | 31 ++++
arch/s390/kernel/vdso.c | 232 +++++++++++++++++++++++++++++++
arch/s390/kernel/vdso32/Makefile | 55 +++++++
arch/s390/kernel/vdso32/clock_getres.S | 39 +++++
arch/s390/kernel/vdso32/clock_gettime.S | 128 +++++++++++++++++
arch/s390/kernel/vdso32/gettimeofday.S | 82 ++++++++++
arch/s390/kernel/vdso32/note.S | 12 +
arch/s390/kernel/vdso32/vdso32.lds.S | 138 ++++++++++++++++++
arch/s390/kernel/vdso32/vdso32_wrapper.S | 13 +
arch/s390/kernel/vdso64/Makefile | 55 +++++++
arch/s390/kernel/vdso64/clock_getres.S | 39 +++++
arch/s390/kernel/vdso64/clock_gettime.S | 89 +++++++++++
arch/s390/kernel/vdso64/gettimeofday.S | 56 +++++++
arch/s390/kernel/vdso64/note.S | 12 +
arch/s390/kernel/vdso64/vdso64.lds.S | 138 ++++++++++++++++++
arch/s390/kernel/vdso64/vdso64_wrapper.S | 13 +
24 files changed, 1217 insertions(+), 2 deletions(-)

Index: quilt-2.6/arch/s390/include/asm/auxvec.h
===================================================================
--- quilt-2.6.orig/arch/s390/include/asm/auxvec.h
+++ quilt-2.6/arch/s390/include/asm/auxvec.h
@@ -1,4 +1,6 @@
#ifndef __ASMS390_AUXVEC_H
#define __ASMS390_AUXVEC_H

+#define AT_SYSINFO_EHDR 33
+
#endif
Index: quilt-2.6/arch/s390/include/asm/elf.h
===================================================================
--- quilt-2.6.orig/arch/s390/include/asm/elf.h
+++ quilt-2.6/arch/s390/include/asm/elf.h
@@ -120,6 +120,10 @@ typedef s390_compat_regs compat_elf_greg
#include <asm/system.h> /* for save_access_regs */
#include <asm/mmu_context.h>

+#include <asm/vdso.h>
+
+extern unsigned int vdso_enabled;
+
/*
* This is used to ensure we don't load something for the wrong architecture.
*/
@@ -193,4 +197,16 @@ do { \
current->mm->context.noexec == 0; \
})

+#define ARCH_DLINFO \
+do { \
+ if (vdso_enabled) \
+ NEW_AUX_ENT(AT_SYSINFO_EHDR, \
+ (unsigned long)current->mm->context.vdso_base); \
+} while (0)
+
+struct linux_binprm;
+
+#define ARCH_HAS_SETUP_ADDITIONAL_PAGES 1
+int arch_setup_additional_pages(struct linux_binprm *, int);
+
#endif
Index: quilt-2.6/arch/s390/include/asm/mmu.h
===================================================================
--- quilt-2.6.orig/arch/s390/include/asm/mmu.h
+++ quilt-2.6/arch/s390/include/asm/mmu.h
@@ -6,6 +6,7 @@ typedef struct {
struct list_head pgtable_list;
unsigned long asce_bits;
unsigned long asce_limit;
+ unsigned long vdso_base;
int noexec;
int has_pgste; /* The mmu context has extended page tables */
int alloc_pgste; /* cloned contexts will have extended page tables */
Index: quilt-2.6/arch/s390/include/asm/page.h
===================================================================
--- quilt-2.6.orig/arch/s390/include/asm/page.h
+++ quilt-2.6/arch/s390/include/asm/page.h
@@ -152,4 +152,6 @@ void arch_alloc_page(struct page *page,
#include <asm-generic/memory_model.h>
#include <asm-generic/page.h>

+#define __HAVE_ARCH_GATE_AREA 1
+
#endif /* _S390_PAGE_H */
Index: quilt-2.6/arch/s390/include/asm/vdso.h
===================================================================
--- /dev/null
+++ quilt-2.6/arch/s390/include/asm/vdso.h
@@ -0,0 +1,39 @@
+#ifndef __S390_VDSO_H__
+#define __S390_VDSO_H__
+
+#ifdef __KERNEL__
+
+/* Default link addresses for the vDSOs */
+#define VDSO32_LBASE 0
+#define VDSO64_LBASE 0
+
+#define VDSO_VERSION_STRING LINUX_2.6.26
+
+#ifndef __ASSEMBLY__
+
+/*
+ * Note about this structure:
+ *
+ * NEVER USE THIS IN USERSPACE CODE DIRECTLY. The layout of this
+ * structure is supposed to be known only to the function in the vdso
+ * itself and may change without notice.
+ */
+
+struct vdso_data {
+ __u64 tb_update_count; /* Timebase atomicity ctr 0x00 */
+ __u64 xtime_tod_stamp; /* TOD clock for xtime 0x08 */
+ __u64 xtime_clock_sec; /* Kernel time 0x10 */
+ __u64 xtime_clock_nsec; /* 0x18 */
+ __u64 wtom_clock_sec; /* Wall to monotonic clock 0x20 */
+ __u64 wtom_clock_nsec; /* 0x28 */
+ __u32 tz_minuteswest; /* Minutes west of Greenwich 0x30 */
+ __u32 tz_dsttime; /* Type of dst correction 0x34 */
+};
+
+extern struct vdso_data *vdso_data;
+
+#endif /* __ASSEMBLY__ */
+
+#endif /* __KERNEL__ */
+
+#endif /* __S390_VDSO_H__ */
Index: quilt-2.6/arch/s390/Kconfig
===================================================================
--- quilt-2.6.orig/arch/s390/Kconfig
+++ quilt-2.6/arch/s390/Kconfig
@@ -43,6 +43,9 @@ config GENERIC_HWEIGHT
config GENERIC_TIME
def_bool y

+config GENERIC_TIME_VSYSCALL
+ def_bool y
+
config GENERIC_CLOCKEVENTS
def_bool y

Index: quilt-2.6/arch/s390/kernel/asm-offsets.c
===================================================================
--- quilt-2.6.orig/arch/s390/kernel/asm-offsets.c
+++ quilt-2.6/arch/s390/kernel/asm-offsets.c
@@ -6,6 +6,7 @@

#include <linux/sched.h>
#include <linux/kbuild.h>
+#include <asm/vdso.h>

int main(void)
{
@@ -38,5 +39,19 @@ int main(void)
DEFINE(__SF_BACKCHAIN, offsetof(struct stack_frame, back_chain));
DEFINE(__SF_GPRS, offsetof(struct stack_frame, gprs));
DEFINE(__SF_EMPTY, offsetof(struct stack_frame, empty1));
+ BLANK();
+ /* timeval/timezone offsets for use by vdso */
+ DEFINE(__VDSO_UPD_COUNT, offsetof(struct vdso_data, tb_update_count));
+ DEFINE(__VDSO_XTIME_STAMP, offsetof(struct vdso_data, xtime_tod_stamp));
+ DEFINE(__VDSO_XTIME_SEC, offsetof(struct vdso_data, xtime_clock_sec));
+ DEFINE(__VDSO_XTIME_NSEC, offsetof(struct vdso_data, xtime_clock_nsec));
+ DEFINE(__VDSO_WTOM_SEC, offsetof(struct vdso_data, wtom_clock_sec));
+ DEFINE(__VDSO_WTOM_NSEC, offsetof(struct vdso_data, wtom_clock_nsec));
+ DEFINE(__VDSO_TIMEZONE, offsetof(struct vdso_data, tz_minuteswest));
+ /* constants used by the vdso */
+ DEFINE(CLOCK_REALTIME, CLOCK_REALTIME);
+ DEFINE(CLOCK_MONOTONIC, CLOCK_MONOTONIC);
+ DEFINE(CLOCK_REALTIME_RES, MONOTONIC_RES_NSEC);
+
return 0;
}
Index: quilt-2.6/arch/s390/kernel/Makefile
===================================================================
--- quilt-2.6.orig/arch/s390/kernel/Makefile
+++ quilt-2.6/arch/s390/kernel/Makefile
@@ -13,8 +13,9 @@ CFLAGS_smp.o := -Wno-nonnull
CFLAGS_ptrace.o += -DUTS_MACHINE='"$(UTS_MACHINE)"'

obj-y := bitmap.o traps.o time.o process.o base.o early.o \
- setup.o sys_s390.o ptrace.o signal.o cpcmd.o ebcdic.o \
- s390_ext.o debug.o irq.o ipl.o dis.o diag.o mem_detect.o
+ setup.o sys_s390.o ptrace.o signal.o cpcmd.o ebcdic.o \
+ s390_ext.o debug.o irq.o ipl.o dis.o diag.o mem_detect.o \
+ vdso.o

obj-y += $(if $(CONFIG_64BIT),entry64.o,entry.o)
obj-y += $(if $(CONFIG_64BIT),reipl64.o,reipl.o)
@@ -39,3 +40,7 @@ S390_KEXEC_OBJS := machine_kexec.o crash
S390_KEXEC_OBJS += $(if $(CONFIG_64BIT),relocate_kernel64.o,relocate_kernel.o)
obj-$(CONFIG_KEXEC) += $(S390_KEXEC_OBJS)

+# vdso
+obj-$(CONFIG_64BIT) += vdso64/
+obj-$(CONFIG_32BIT) += vdso32/
+obj-$(CONFIG_COMPAT) += vdso32/
Index: quilt-2.6/arch/s390/kernel/time.c
===================================================================
--- quilt-2.6.orig/arch/s390/kernel/time.c
+++ quilt-2.6/arch/s390/kernel/time.c
@@ -36,6 +36,7 @@
#include <asm/delay.h>
#include <asm/s390_ext.h>
#include <asm/div64.h>
+#include <asm/vdso.h>
#include <asm/irq.h>
#include <asm/irq_regs.h>
#include <asm/timer.h>
@@ -223,6 +224,36 @@ static struct clocksource clocksource_to
};


+void update_vsyscall(struct timespec *wall_time, struct clocksource *clock)
+{
+ if (clock != &clocksource_tod)
+ return;
+
+ /* Make userspace gettimeofday spin until we're done. */
+ ++vdso_data->tb_update_count;
+ smp_mb();
+ vdso_data->xtime_tod_stamp = clock->cycle_last;
+ vdso_data->xtime_clock_sec = xtime.tv_sec;
+ vdso_data->xtime_clock_nsec = xtime.tv_nsec;
+ vdso_data->wtom_clock_sec = wall_to_monotonic.tv_sec;
+ vdso_data->wtom_clock_nsec = wall_to_monotonic.tv_nsec;
+ smp_wmb();
+ ++(vdso_data->tb_update_count);
+}
+
+extern struct timezone sys_tz;
+
+void update_vsyscall_tz(void)
+{
+ /* Make userspace gettimeofday spin until we're done. */
+ ++vdso_data->tb_update_count;
+ smp_mb();
+ vdso_data->tz_minuteswest = sys_tz.tz_minuteswest;
+ vdso_data->tz_dsttime = sys_tz.tz_dsttime;
+ smp_mb();
+ ++vdso_data->tb_update_count;
+}
+
/*
* Initialize the TOD clock and the CPU timer of
* the boot cpu.
Index: quilt-2.6/arch/s390/kernel/vdso32/clock_getres.S
===================================================================
--- /dev/null
+++ quilt-2.6/arch/s390/kernel/vdso32/clock_getres.S
@@ -0,0 +1,39 @@
+/*
+ * Userland implementation of clock_getres() for 32 bits processes in a
+ * s390 kernel for use in the vDSO
+ *
+ * Copyright IBM Corp. 2008
+ * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License (version 2 only)
+ * as published by the Free Software Foundation.
+ */
+#include <asm/vdso.h>
+#include <asm/asm-offsets.h>
+#include <asm/unistd.h>
+
+ .text
+ .align 4
+ .globl __kernel_clock_getres
+ .type __kernel_clock_getres,@function
+__kernel_clock_getres:
+ .cfi_startproc
+ chi %r2,CLOCK_REALTIME
+ je 0f
+ chi %r2,CLOCK_MONOTONIC
+ jne 3f
+0: ltr %r3,%r3
+ jz 2f /* res == NULL */
+ basr %r1,0
+1: l %r0,4f-1b(%r1)
+ xc 0(4,%r3),0(%r3) /* set tp->tv_sec to zero */
+ st %r0,4(%r3) /* store tp->tv_usec */
+2: lhi %r2,0
+ br %r14
+3: lhi %r1,__NR_clock_getres /* fallback to svc */
+ svc 0
+ br %r14
+4: .long CLOCK_REALTIME_RES
+ .cfi_endproc
+ .size __kernel_clock_getres,.-__kernel_clock_getres
Index: quilt-2.6/arch/s390/kernel/vdso32/clock_gettime.S
===================================================================
--- /dev/null
+++ quilt-2.6/arch/s390/kernel/vdso32/clock_gettime.S
@@ -0,0 +1,128 @@
+/*
+ * Userland implementation of clock_gettime() for 32 bits processes in a
+ * s390 kernel for use in the vDSO
+ *
+ * Copyright IBM Corp. 2008
+ * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License (version 2 only)
+ * as published by the Free Software Foundation.
+ */
+#include <asm/vdso.h>
+#include <asm/asm-offsets.h>
+#include <asm/unistd.h>
+
+ .text
+ .align 4
+ .globl __kernel_clock_gettime
+ .type __kernel_clock_gettime,@function
+__kernel_clock_gettime:
+ .cfi_startproc
+ basr %r5,0
+0: al %r5,21f-0b(%r5) /* get &_vdso_data */
+ chi %r2,CLOCK_REALTIME
+ je 10f
+ chi %r2,CLOCK_MONOTONIC
+ jne 19f
+
+ /* CLOCK_MONOTONIC */
+ ltr %r3,%r3
+ jz 9f /* tp == NULL */
+1: l %r4,__VDSO_UPD_COUNT+4(%r5) /* load update counter */
+ tml %r4,0x0001 /* pending update ? loop */
+ jnz 1b
+ stck 24(%r15) /* Store TOD clock */
+ lm %r0,%r1,24(%r15)
+ s %r0,__VDSO_XTIME_STAMP(%r5) /* TOD - cycle_last */
+ sl %r1,__VDSO_XTIME_STAMP+4(%r5)
+ brc 3,2f
+ ahi %r0,-1
+2: mhi %r0,1000 /* cyc2ns(clock,cycle_delta) */
+ lr %r2,%r0
+ lhi %r0,1000
+ ltr %r1,%r1
+ mr %r0,%r0
+ jnm 3f
+ ahi %r0,1000
+3: alr %r0,%r2
+ srdl %r0,12
+ al %r0,__VDSO_XTIME_NSEC(%r5) /* + xtime */
+ al %r1,__VDSO_XTIME_NSEC+4(%r5)
+ brc 12,4f
+ ahi %r0,1
+4: l %r2,__VDSO_XTIME_SEC+4(%r5)
+ al %r0,__VDSO_WTOM_NSEC(%r5) /* + wall_to_monotonic */
+ al %r1,__VDSO_WTOM_NSEC+4(%r5)
+ brc 12,5f
+ ahi %r0,1
+5: al %r2,__VDSO_WTOM_SEC+4(%r5)
+ cl %r4,__VDSO_UPD_COUNT+4(%r5) /* check update counter */
+ jne 1b
+ basr %r5,0
+6: ltr %r0,%r0
+ jnz 7f
+ cl %r1,20f-6b(%r5)
+ jl 8f
+7: ahi %r2,1
+ sl %r1,20f-6b(%r5)
+ brc 3,6b
+ ahi %r0,-1
+ j 6b
+8: st %r2,0(%r3) /* store tp->tv_sec */
+ st %r1,4(%r3) /* store tp->tv_nsec */
+9: lhi %r2,0
+ br %r14
+
+ /* CLOCK_REALTIME */
+10: ltr %r3,%r3 /* tp == NULL */
+ jz 18f
+11: l %r4,__VDSO_UPD_COUNT+4(%r5) /* load update counter */
+ tml %r4,0x0001 /* pending update ? loop */
+ jnz 11b
+ stck 24(%r15) /* Store TOD clock */
+ lm %r0,%r1,24(%r15)
+ s %r0,__VDSO_XTIME_STAMP(%r5) /* TOD - cycle_last */
+ sl %r1,__VDSO_XTIME_STAMP+4(%r5)
+ brc 3,12f
+ ahi %r0,-1
+12: mhi %r0,1000 /* cyc2ns(clock,cycle_delta) */
+ lr %r2,%r0
+ lhi %r0,1000
+ ltr %r1,%r1
+ mr %r0,%r0
+ jnm 13f
+ ahi %r0,1000
+13: alr %r0,%r2
+ srdl %r0,12
+ al %r0,__VDSO_XTIME_NSEC(%r5) /* + xtime */
+ al %r1,__VDSO_XTIME_NSEC+4(%r5)
+ brc 12,14f
+ ahi %r0,1
+14: l %r2,__VDSO_XTIME_SEC+4(%r5)
+ cl %r4,__VDSO_UPD_COUNT+4(%r5) /* check update counter */
+ jne 11b
+ basr %r5,0
+15: ltr %r0,%r0
+ jnz 16f
+ cl %r1,20f-15b(%r5)
+ jl 17f
+16: ahi %r2,1
+ sl %r1,20f-15b(%r5)
+ brc 3,15b
+ ahi %r0,-1
+ j 15b
+17: st %r2,0(%r3) /* store tp->tv_sec */
+ st %r1,4(%r3) /* store tp->tv_nsec */
+18: lhi %r2,0
+ br %r14
+
+ /* Fallback to system call */
+19: lhi %r1,__NR_clock_gettime
+ svc 0
+ br %r14
+
+20: .long 1000000000
+21: .long _vdso_data - 0b
+ .cfi_endproc
+ .size __kernel_clock_gettime,.-__kernel_clock_gettime
Index: quilt-2.6/arch/s390/kernel/vdso32/gettimeofday.S
===================================================================
--- /dev/null
+++ quilt-2.6/arch/s390/kernel/vdso32/gettimeofday.S
@@ -0,0 +1,82 @@
+/*
+ * Userland implementation of gettimeofday() for 32 bits processes in a
+ * s390 kernel for use in the vDSO
+ *
+ * Copyright IBM Corp. 2008
+ * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License (version 2 only)
+ * as published by the Free Software Foundation.
+ */
+#include <asm/vdso.h>
+#include <asm/asm-offsets.h>
+#include <asm/unistd.h>
+
+#include <asm/vdso.h>
+#include <asm/asm-offsets.h>
+#include <asm/unistd.h>
+
+ .text
+ .align 4
+ .globl __kernel_gettimeofday
+ .type __kernel_gettimeofday,@function
+__kernel_gettimeofday:
+ .cfi_startproc
+ basr %r5,0
+0: al %r5,13f-0b(%r5) /* get &_vdso_data */
+1: ltr %r3,%r3 /* check if tz is NULL */
+ je 2f
+ mvc 0(8,%r3),__VDSO_TIMEZONE(%r5)
+2: ltr %r2,%r2 /* check if tv is NULL */
+ je 10f
+ l %r4,__VDSO_UPD_COUNT+4(%r5) /* load update counter */
+ tml %r4,0x0001 /* pending update ? loop */
+ jnz 1b
+ stck 24(%r15) /* Store TOD clock */
+ lm %r0,%r1,24(%r15)
+ s %r0,__VDSO_XTIME_STAMP(%r5) /* TOD - cycle_last */
+ sl %r1,__VDSO_XTIME_STAMP+4(%r5)
+ brc 3,3f
+ ahi %r0,-1
+3: mhi %r0,1000 /* cyc2ns(clock,cycle_delta) */
+ st %r0,24(%r15)
+ lhi %r0,1000
+ ltr %r1,%r1
+ mr %r0,%r0
+ jnm 4f
+ ahi %r0,1000
+4: al %r0,24(%r15)
+ srdl %r0,12
+ al %r0,__VDSO_XTIME_NSEC(%r5) /* + xtime */
+ al %r1,__VDSO_XTIME_NSEC+4(%r5)
+ brc 12,5f
+ ahi %r0,1
+5: mvc 24(4,%r15),__VDSO_XTIME_SEC+4(%r5)
+ cl %r4,__VDSO_UPD_COUNT+4(%r5) /* check update counter */
+ jne 1b
+ l %r4,24(%r15) /* get tv_sec from stack */
+ basr %r5,0
+6: ltr %r0,%r0
+ jnz 7f
+ cl %r1,11f-6b(%r5)
+ jl 8f
+7: ahi %r4,1
+ sl %r1,11f-6b(%r5)
+ brc 3,6b
+ ahi %r0,-1
+ j 6b
+8: st %r4,0(%r2) /* store tv->tv_sec */
+ ltr %r1,%r1
+ m %r0,12f-6b(%r5)
+ jnm 9f
+ al %r0,12f-6b(%r5)
+9: srl %r0,6
+ st %r0,4(%r2) /* store tv->tv_usec */
+10: slr %r2,%r2
+ br %r14
+11: .long 1000000000
+12: .long 274877907
+13: .long _vdso_data - 0b
+ .cfi_endproc
+ .size __kernel_gettimeofday,.-__kernel_gettimeofday
Index: quilt-2.6/arch/s390/kernel/vdso32/Makefile
===================================================================
--- /dev/null
+++ quilt-2.6/arch/s390/kernel/vdso32/Makefile
@@ -0,0 +1,55 @@
+# List of files in the vdso, has to be asm only for now
+
+obj-vdso32 = gettimeofday.o clock_getres.o clock_gettime.o note.o
+
+# Build rules
+
+targets := $(obj-vdso32) vdso32.so vdso32.so.dbg
+obj-vdso32 := $(addprefix $(obj)/, $(obj-vdso32))
+
+KBUILD_AFLAGS_31 := $(filter-out -m64,$(KBUILD_AFLAGS))
+KBUILD_AFLAGS_31 += -m31 -s
+
+KBUILD_CFLAGS_31 := $(filter-out -m64,$(KBUILD_CFLAGS))
+KBUILD_CFLAGS_31 += -m31 -fPIC -shared -fno-common -fno-builtin
+KBUILD_CFLAGS_31 += -nostdlib -Wl,-soname=linux-vdso32.so.1 \
+ $(call ld-option, -Wl$(comma)--hash-style=sysv)
+
+$(targets:%=$(obj)/%.dbg): KBUILD_CFLAGS = $(KBUILD_CFLAGS_31)
+$(targets:%=$(obj)/%.dbg): KBUILD_AFLAGS = $(KBUILD_AFLAGS_31)
+
+obj-y += vdso32_wrapper.o
+extra-y += vdso32.lds
+CPPFLAGS_vdso32.lds += -P -C -U$(ARCH)
+
+# Force dependency (incbin is bad)
+$(obj)/vdso32_wrapper.o : $(obj)/vdso32.so
+
+# link rule for the .so file, .lds has to be first
+$(obj)/vdso32.so.dbg: $(src)/vdso32.lds $(obj-vdso32)
+ $(call if_changed,vdso32ld)
+
+# strip rule for the .so file
+$(obj)/%.so: OBJCOPYFLAGS := -S
+$(obj)/%.so: $(obj)/%.so.dbg FORCE
+ $(call if_changed,objcopy)
+
+# assembly rules for the .S files
+$(obj-vdso32): %.o: %.S
+ $(call if_changed_dep,vdso32as)
+
+# actual build commands
+quiet_cmd_vdso32ld = VDSO32L $@
+ cmd_vdso32ld = $(CC) $(c_flags) -Wl,-T $^ -o $@
+quiet_cmd_vdso32as = VDSO32A $@
+ cmd_vdso32as = $(CC) $(a_flags) -c -o $@ $<
+
+# install commands for the unstripped file
+quiet_cmd_vdso_install = INSTALL $@
+ cmd_vdso_install = cp $(obj)/$@.dbg $(MODLIB)/vdso/$@
+
+vdso32.so: $(obj)/vdso32.so.dbg
+ @mkdir -p $(MODLIB)/vdso
+ $(call cmd,vdso_install)
+
+vdso_install: vdso32.so
Index: quilt-2.6/arch/s390/kernel/vdso32/note.S
===================================================================
--- /dev/null
+++ quilt-2.6/arch/s390/kernel/vdso32/note.S
@@ -0,0 +1,12 @@
+/*
+ * This supplies .note.* sections to go into the PT_NOTE inside the vDSO text.
+ * Here we can supply some information useful to userland.
+ */
+
+#include <linux/uts.h>
+#include <linux/version.h>
+#include <linux/elfnote.h>
+
+ELFNOTE_START(Linux, 0, "a")
+ .long LINUX_VERSION_CODE
+ELFNOTE_END
Index: quilt-2.6/arch/s390/kernel/vdso32/vdso32.lds.S
===================================================================
--- /dev/null
+++ quilt-2.6/arch/s390/kernel/vdso32/vdso32.lds.S
@@ -0,0 +1,138 @@
+/*
+ * This is the infamous ld script for the 32 bits vdso
+ * library
+ */
+#include <asm/vdso.h>
+
+OUTPUT_FORMAT("elf32-s390", "elf32-s390", "elf32-s390")
+OUTPUT_ARCH(s390:31-bit)
+ENTRY(_start)
+
+SECTIONS
+{
+ . = VDSO32_LBASE + SIZEOF_HEADERS;
+
+ .hash : { *(.hash) } :text
+ .gnu.hash : { *(.gnu.hash) }
+ .dynsym : { *(.dynsym) }
+ .dynstr : { *(.dynstr) }
+ .gnu.version : { *(.gnu.version) }
+ .gnu.version_d : { *(.gnu.version_d) }
+ .gnu.version_r : { *(.gnu.version_r) }
+
+ .note : { *(.note.*) } :text :note
+
+ . = ALIGN(16);
+ .text : {
+ *(.text .stub .text.* .gnu.linkonce.t.*)
+ } :text
+ PROVIDE(__etext = .);
+ PROVIDE(_etext = .);
+ PROVIDE(etext = .);
+
+ /*
+ * Other stuff is appended to the text segment:
+ */
+ .rodata : { *(.rodata .rodata.* .gnu.linkonce.r.*) }
+ .rodata1 : { *(.rodata1) }
+
+ .dynamic : { *(.dynamic) } :text :dynamic
+
+ .eh_frame_hdr : { *(.eh_frame_hdr) } :text :eh_frame_hdr
+ .eh_frame : { KEEP (*(.eh_frame)) } :text
+ .gcc_except_table : { *(.gcc_except_table .gcc_except_table.*) }
+
+ .rela.dyn ALIGN(8) : { *(.rela.dyn) }
+ .got ALIGN(8) : { *(.got .toc) }
+
+ _end = .;
+ PROVIDE(end = .);
+
+ /*
+ * Stabs debugging sections are here too.
+ */
+ .stab 0 : { *(.stab) }
+ .stabstr 0 : { *(.stabstr) }
+ .stab.excl 0 : { *(.stab.excl) }
+ .stab.exclstr 0 : { *(.stab.exclstr) }
+ .stab.index 0 : { *(.stab.index) }
+ .stab.indexstr 0 : { *(.stab.indexstr) }
+ .comment 0 : { *(.comment) }
+
+ /*
+ * DWARF debug sections.
+ * Symbols in the DWARF debugging sections are relative to the
+ * beginning of the section so we begin them at 0.
+ */
+ /* DWARF 1 */
+ .debug 0 : { *(.debug) }
+ .line 0 : { *(.line) }
+ /* GNU DWARF 1 extensions */
+ .debug_srcinfo 0 : { *(.debug_srcinfo) }
+ .debug_sfnames 0 : { *(.debug_sfnames) }
+ /* DWARF 1.1 and DWARF 2 */
+ .debug_aranges 0 : { *(.debug_aranges) }
+ .debug_pubnames 0 : { *(.debug_pubnames) }
+ /* DWARF 2 */
+ .debug_info 0 : { *(.debug_info .gnu.linkonce.wi.*) }
+ .debug_abbrev 0 : { *(.debug_abbrev) }
+ .debug_line 0 : { *(.debug_line) }
+ .debug_frame 0 : { *(.debug_frame) }
+ .debug_str 0 : { *(.debug_str) }
+ .debug_loc 0 : { *(.debug_loc) }
+ .debug_macinfo 0 : { *(.debug_macinfo) }
+ /* SGI/MIPS DWARF 2 extensions */
+ .debug_weaknames 0 : { *(.debug_weaknames) }
+ .debug_funcnames 0 : { *(.debug_funcnames) }
+ .debug_typenames 0 : { *(.debug_typenames) }
+ .debug_varnames 0 : { *(.debug_varnames) }
+ /* DWARF 3 */
+ .debug_pubtypes 0 : { *(.debug_pubtypes) }
+ .debug_ranges 0 : { *(.debug_ranges) }
+ .gnu.attributes 0 : { KEEP (*(.gnu.attributes)) }
+
+ . = ALIGN(4096);
+ PROVIDE(_vdso_data = .);
+
+ /DISCARD/ : {
+ *(.note.GNU-stack)
+ *(.branch_lt)
+ *(.data .data.* .gnu.linkonce.d.* .sdata*)
+ *(.bss .sbss .dynbss .dynsbss)
+ }
+}
+
+/*
+ * Very old versions of ld do not recognize this name token; use the constant.
+ */
+#define PT_GNU_EH_FRAME 0x6474e550
+
+/*
+ * We must supply the ELF program headers explicitly to get just one
+ * PT_LOAD segment, and set the flags explicitly to make segments read-only.
+ */
+PHDRS
+{
+ text PT_LOAD FILEHDR PHDRS FLAGS(5); /* PF_R|PF_X */
+ dynamic PT_DYNAMIC FLAGS(4); /* PF_R */
+ note PT_NOTE FLAGS(4); /* PF_R */
+ eh_frame_hdr PT_GNU_EH_FRAME;
+}
+
+/*
+ * This controls what symbols we export from the DSO.
+ */
+VERSION
+{
+ VDSO_VERSION_STRING {
+ global:
+ /*
+ * Has to be there for the kernel to find
+ */
+ __kernel_gettimeofday;
+ __kernel_clock_gettime;
+ __kernel_clock_getres;
+
+ local: *;
+ };
+}
Index: quilt-2.6/arch/s390/kernel/vdso32/vdso32_wrapper.S
===================================================================
--- /dev/null
+++ quilt-2.6/arch/s390/kernel/vdso32/vdso32_wrapper.S
@@ -0,0 +1,13 @@
+#include <linux/init.h>
+#include <asm/page.h>
+
+ .section ".data.page_aligned"
+
+ .globl vdso32_start, vdso32_end
+ .balign PAGE_SIZE
+vdso32_start:
+ .incbin "arch/s390/kernel/vdso32/vdso32.so"
+ .balign PAGE_SIZE
+vdso32_end:
+
+ .previous
Index: quilt-2.6/arch/s390/kernel/vdso64/clock_getres.S
===================================================================
--- /dev/null
+++ quilt-2.6/arch/s390/kernel/vdso64/clock_getres.S
@@ -0,0 +1,39 @@
+/*
+ * Userland implementation of clock_getres() for 64 bits processes in a
+ * s390 kernel for use in the vDSO
+ *
+ * Copyright IBM Corp. 2008
+ * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License (version 2 only)
+ * as published by the Free Software Foundation.
+ */
+#include <asm/vdso.h>
+#include <asm/asm-offsets.h>
+#include <asm/unistd.h>
+
+ .text
+ .align 4
+ .globl __kernel_clock_getres
+ .type __kernel_clock_getres,@function
+__kernel_clock_getres:
+ .cfi_startproc
+ cghi %r2,CLOCK_REALTIME
+ je 0f
+ cghi %r2,CLOCK_MONOTONIC
+ jne 2f
+0: ltgr %r3,%r3
+ jz 1f /* res == NULL */
+ larl %r1,3f
+ lg %r0,0(%r1)
+ xc 0(8,%r3),0(%r3) /* set tp->tv_sec to zero */
+ stg %r0,8(%r3) /* store tp->tv_usec */
+1: lghi %r2,0
+ br %r14
+2: lghi %r1,__NR_clock_getres /* fallback to svc */
+ svc 0
+ br %r14
+3: .quad CLOCK_REALTIME_RES
+ .cfi_endproc
+ .size __kernel_clock_getres,.-__kernel_clock_getres
Index: quilt-2.6/arch/s390/kernel/vdso64/clock_gettime.S
===================================================================
--- /dev/null
+++ quilt-2.6/arch/s390/kernel/vdso64/clock_gettime.S
@@ -0,0 +1,89 @@
+/*
+ * Userland implementation of clock_gettime() for 64 bits processes in a
+ * s390 kernel for use in the vDSO
+ *
+ * Copyright IBM Corp. 2008
+ * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License (version 2 only)
+ * as published by the Free Software Foundation.
+ */
+#include <asm/vdso.h>
+#include <asm/asm-offsets.h>
+#include <asm/unistd.h>
+
+ .text
+ .align 4
+ .globl __kernel_clock_gettime
+ .type __kernel_clock_gettime,@function
+__kernel_clock_gettime:
+ .cfi_startproc
+ larl %r5,_vdso_data
+ cghi %r2,CLOCK_REALTIME
+ je 4f
+ cghi %r2,CLOCK_MONOTONIC
+ jne 9f
+
+ /* CLOCK_MONOTONIC */
+ ltgr %r3,%r3
+ jz 3f /* tp == NULL */
+0: lg %r4,__VDSO_UPD_COUNT(%r5) /* load update counter */
+ tmll %r4,0x0001 /* pending update ? loop */
+ jnz 0b
+ stck 48(%r15) /* Store TOD clock */
+ lg %r1,48(%r15)
+ sg %r1,__VDSO_XTIME_STAMP(%r5) /* TOD - cycle_last */
+ mghi %r1,1000
+ srlg %r1,%r1,12 /* cyc2ns(clock,cycle_delta) */
+ alg %r1,__VDSO_XTIME_NSEC(%r5) /* + xtime */
+ lg %r0,__VDSO_XTIME_SEC(%r5)
+ alg %r1,__VDSO_WTOM_NSEC(%r5) /* + wall_to_monotonic */
+ alg %r0,__VDSO_WTOM_SEC(%r5)
+ clg %r4,__VDSO_UPD_COUNT(%r5) /* check update counter */
+ jne 0b
+ larl %r5,10f
+1: clg %r1,0(%r5)
+ jl 2f
+ slg %r1,0(%r5)
+ aghi %r0,1
+ j 1b
+2: stg %r0,0(%r3) /* store tp->tv_sec */
+ stg %r1,8(%r3) /* store tp->tv_nsec */
+3: lghi %r2,0
+ br %r14
+
+ /* CLOCK_REALTIME */
+4: ltr %r3,%r3 /* tp == NULL */
+ jz 8f
+5: lg %r4,__VDSO_UPD_COUNT(%r5) /* load update counter */
+ tmll %r4,0x0001 /* pending update ? loop */
+ jnz 5b
+ stck 48(%r15) /* Store TOD clock */
+ lg %r1,48(%r15)
+ sg %r1,__VDSO_XTIME_STAMP(%r5) /* TOD - cycle_last */
+ mghi %r1,1000
+ srlg %r1,%r1,12 /* cyc2ns(clock,cycle_delta) */
+ alg %r1,__VDSO_XTIME_NSEC(%r5) /* + xtime */
+ lg %r0,__VDSO_XTIME_SEC(%r5)
+ clg %r4,__VDSO_UPD_COUNT(%r5) /* check update counter */
+ jne 5b
+ larl %r5,10f
+6: clg %r1,0(%r5)
+ jl 7f
+ slg %r1,0(%r5)
+ aghi %r0,1
+ j 6b
+7: stg %r0,0(%r3) /* store tp->tv_sec */
+ stg %r1,8(%r3) /* store tp->tv_nsec */
+8: lghi %r2,0
+ br %r14
+
+ /* Fallback to system call */
+9: lghi %r1,__NR_clock_gettime
+ svc 0
+ br %r14
+
+10: .quad 1000000000
+ .cfi_endproc
+ .size __kernel_clock_gettime,.-__kernel_clock_gettime
Index: quilt-2.6/arch/s390/kernel/vdso64/gettimeofday.S
===================================================================
--- /dev/null
+++ quilt-2.6/arch/s390/kernel/vdso64/gettimeofday.S
@@ -0,0 +1,56 @@
+/*
+ * Userland implementation of gettimeofday() for 64 bits processes in a
+ * s390 kernel for use in the vDSO
+ *
+ * Copyright IBM Corp. 2008
+ * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License (version 2 only)
+ * as published by the Free Software Foundation.
+ */
+#include <asm/vdso.h>
+#include <asm/asm-offsets.h>
+#include <asm/unistd.h>
+
+ .text
+ .align 4
+ .globl __kernel_gettimeofday
+ .type __kernel_gettimeofday,@function
+__kernel_gettimeofday:
+ .cfi_startproc
+ larl %r5,_vdso_data
+0: ltgr %r3,%r3 /* check if tz is NULL */
+ je 1f
+ mvc 0(8,%r3),__VDSO_TIMEZONE(%r5)
+1: ltgr %r2,%r2 /* check if tv is NULL */
+ je 4f
+ lg %r4,__VDSO_UPD_COUNT(%r5) /* load update counter */
+ tmll %r4,0x0001 /* pending update ? loop */
+ jnz 0b
+ stck 48(%r15) /* Store TOD clock */
+ lg %r1,48(%r15)
+ sg %r1,__VDSO_XTIME_STAMP(%r5) /* TOD - cycle_last */
+ mghi %r1,1000
+ srlg %r1,%r1,12 /* cyc2ns(clock,cycle_delta) */
+ alg %r1,__VDSO_XTIME_NSEC(%r5) /* + xtime.tv_nsec */
+ lg %r0,__VDSO_XTIME_SEC(%r5) /* xtime.tv_sec */
+ clg %r4,__VDSO_UPD_COUNT(%r5) /* check update counter */
+ jne 0b
+ larl %r5,5f
+2: clg %r1,0(%r5)
+ jl 3f
+ slg %r1,0(%r5)
+ aghi %r0,1
+ j 2b
+3: stg %r0,0(%r2) /* store tv->tv_sec */
+ slgr %r0,%r0 /* tv_nsec -> tv_usec */
+ ml %r0,8(%r5)
+ srlg %r0,%r0,6
+ stg %r0,8(%r2) /* store tv->tv_usec */
+4: lghi %r2,0
+ br %r14
+5: .quad 1000000000
+ .long 274877907
+ .cfi_endproc
+ .size __kernel_gettimeofday,.-__kernel_gettimeofday
Index: quilt-2.6/arch/s390/kernel/vdso64/Makefile
===================================================================
--- /dev/null
+++ quilt-2.6/arch/s390/kernel/vdso64/Makefile
@@ -0,0 +1,55 @@
+# List of files in the vdso, has to be asm only for now
+
+obj-vdso64 = gettimeofday.o clock_getres.o clock_gettime.o note.o
+
+# Build rules
+
+targets := $(obj-vdso64) vdso64.so vdso64.so.dbg
+obj-vdso64 := $(addprefix $(obj)/, $(obj-vdso64))
+
+KBUILD_AFLAGS_64 := $(filter-out -m64,$(KBUILD_AFLAGS))
+KBUILD_AFLAGS_64 += -m64 -s
+
+KBUILD_CFLAGS_64 := $(filter-out -m64,$(KBUILD_CFLAGS))
+KBUILD_CFLAGS_64 += -m64 -fPIC -shared -fno-common -fno-builtin
+KBUILD_CFLAGS_64 += -nostdlib -Wl,-soname=linux-vdso64.so.1 \
+ $(call ld-option, -Wl$(comma)--hash-style=sysv)
+
+$(targets:%=$(obj)/%.dbg): KBUILD_CFLAGS = $(KBUILD_CFLAGS_64)
+$(targets:%=$(obj)/%.dbg): KBUILD_AFLAGS = $(KBUILD_AFLAGS_64)
+
+obj-y += vdso64_wrapper.o
+extra-y += vdso64.lds
+CPPFLAGS_vdso64.lds += -P -C -U$(ARCH)
+
+# Force dependency (incbin is bad)
+$(obj)/vdso64_wrapper.o : $(obj)/vdso64.so
+
+# link rule for the .so file, .lds has to be first
+$(obj)/vdso64.so.dbg: $(src)/vdso64.lds $(obj-vdso64)
+ $(call if_changed,vdso64ld)
+
+# strip rule for the .so file
+$(obj)/%.so: OBJCOPYFLAGS := -S
+$(obj)/%.so: $(obj)/%.so.dbg FORCE
+ $(call if_changed,objcopy)
+
+# assembly rules for the .S files
+$(obj-vdso64): %.o: %.S
+ $(call if_changed_dep,vdso64as)
+
+# actual build commands
+quiet_cmd_vdso64ld = VDSO64L $@
+ cmd_vdso64ld = $(CC) $(c_flags) -Wl,-T $^ -o $@
+quiet_cmd_vdso64as = VDSO64A $@
+ cmd_vdso64as = $(CC) $(a_flags) -c -o $@ $<
+
+# install commands for the unstripped file
+quiet_cmd_vdso_install = INSTALL $@
+ cmd_vdso_install = cp $(obj)/$@.dbg $(MODLIB)/vdso/$@
+
+vdso64.so: $(obj)/vdso64.so.dbg
+ @mkdir -p $(MODLIB)/vdso
+ $(call cmd,vdso_install)
+
+vdso_install: vdso64.so
Index: quilt-2.6/arch/s390/kernel/vdso64/note.S
===================================================================
--- /dev/null
+++ quilt-2.6/arch/s390/kernel/vdso64/note.S
@@ -0,0 +1,12 @@
+/*
+ * This supplies .note.* sections to go into the PT_NOTE inside the vDSO text.
+ * Here we can supply some information useful to userland.
+ */
+
+#include <linux/uts.h>
+#include <linux/version.h>
+#include <linux/elfnote.h>
+
+ELFNOTE_START(Linux, 0, "a")
+ .long LINUX_VERSION_CODE
+ELFNOTE_END
Index: quilt-2.6/arch/s390/kernel/vdso64/vdso64.lds.S
===================================================================
--- /dev/null
+++ quilt-2.6/arch/s390/kernel/vdso64/vdso64.lds.S
@@ -0,0 +1,138 @@
+/*
+ * This is the infamous ld script for the 64 bits vdso
+ * library
+ */
+#include <asm/vdso.h>
+
+OUTPUT_FORMAT("elf64-s390", "elf64-s390", "elf64-s390")
+OUTPUT_ARCH(s390:64-bit)
+ENTRY(_start)
+
+SECTIONS
+{
+ . = VDSO64_LBASE + SIZEOF_HEADERS;
+
+ .hash : { *(.hash) } :text
+ .gnu.hash : { *(.gnu.hash) }
+ .dynsym : { *(.dynsym) }
+ .dynstr : { *(.dynstr) }
+ .gnu.version : { *(.gnu.version) }
+ .gnu.version_d : { *(.gnu.version_d) }
+ .gnu.version_r : { *(.gnu.version_r) }
+
+ .note : { *(.note.*) } :text :note
+
+ . = ALIGN(16);
+ .text : {
+ *(.text .stub .text.* .gnu.linkonce.t.*)
+ } :text
+ PROVIDE(__etext = .);
+ PROVIDE(_etext = .);
+ PROVIDE(etext = .);
+
+ /*
+ * Other stuff is appended to the text segment:
+ */
+ .rodata : { *(.rodata .rodata.* .gnu.linkonce.r.*) }
+ .rodata1 : { *(.rodata1) }
+
+ .dynamic : { *(.dynamic) } :text :dynamic
+
+ .eh_frame_hdr : { *(.eh_frame_hdr) } :text :eh_frame_hdr
+ .eh_frame : { KEEP (*(.eh_frame)) } :text
+ .gcc_except_table : { *(.gcc_except_table .gcc_except_table.*) }
+
+ .rela.dyn ALIGN(8) : { *(.rela.dyn) }
+ .got ALIGN(8) : { *(.got .toc) }
+
+ _end = .;
+ PROVIDE(end = .);
+
+ /*
+ * Stabs debugging sections are here too.
+ */
+ .stab 0 : { *(.stab) }
+ .stabstr 0 : { *(.stabstr) }
+ .stab.excl 0 : { *(.stab.excl) }
+ .stab.exclstr 0 : { *(.stab.exclstr) }
+ .stab.index 0 : { *(.stab.index) }
+ .stab.indexstr 0 : { *(.stab.indexstr) }
+ .comment 0 : { *(.comment) }
+
+ /*
+ * DWARF debug sections.
+ * Symbols in the DWARF debugging sections are relative to the
+ * beginning of the section so we begin them at 0.
+ */
+ /* DWARF 1 */
+ .debug 0 : { *(.debug) }
+ .line 0 : { *(.line) }
+ /* GNU DWARF 1 extensions */
+ .debug_srcinfo 0 : { *(.debug_srcinfo) }
+ .debug_sfnames 0 : { *(.debug_sfnames) }
+ /* DWARF 1.1 and DWARF 2 */
+ .debug_aranges 0 : { *(.debug_aranges) }
+ .debug_pubnames 0 : { *(.debug_pubnames) }
+ /* DWARF 2 */
+ .debug_info 0 : { *(.debug_info .gnu.linkonce.wi.*) }
+ .debug_abbrev 0 : { *(.debug_abbrev) }
+ .debug_line 0 : { *(.debug_line) }
+ .debug_frame 0 : { *(.debug_frame) }
+ .debug_str 0 : { *(.debug_str) }
+ .debug_loc 0 : { *(.debug_loc) }
+ .debug_macinfo 0 : { *(.debug_macinfo) }
+ /* SGI/MIPS DWARF 2 extensions */
+ .debug_weaknames 0 : { *(.debug_weaknames) }
+ .debug_funcnames 0 : { *(.debug_funcnames) }
+ .debug_typenames 0 : { *(.debug_typenames) }
+ .debug_varnames 0 : { *(.debug_varnames) }
+ /* DWARF 3 */
+ .debug_pubtypes 0 : { *(.debug_pubtypes) }
+ .debug_ranges 0 : { *(.debug_ranges) }
+ .gnu.attributes 0 : { KEEP (*(.gnu.attributes)) }
+
+ . = ALIGN(4096);
+ PROVIDE(_vdso_data = .);
+
+ /DISCARD/ : {
+ *(.note.GNU-stack)
+ *(.branch_lt)
+ *(.data .data.* .gnu.linkonce.d.* .sdata*)
+ *(.bss .sbss .dynbss .dynsbss)
+ }
+}
+
+/*
+ * Very old versions of ld do not recognize this name token; use the constant.
+ */
+#define PT_GNU_EH_FRAME 0x6474e550
+
+/*
+ * We must supply the ELF program headers explicitly to get just one
+ * PT_LOAD segment, and set the flags explicitly to make segments read-only.
+ */
+PHDRS
+{
+ text PT_LOAD FILEHDR PHDRS FLAGS(5); /* PF_R|PF_X */
+ dynamic PT_DYNAMIC FLAGS(4); /* PF_R */
+ note PT_NOTE FLAGS(4); /* PF_R */
+ eh_frame_hdr PT_GNU_EH_FRAME;
+}
+
+/*
+ * This controls what symbols we export from the DSO.
+ */
+VERSION
+{
+ VDSO_VERSION_STRING {
+ global:
+ /*
+ * Has to be there for the kernel to find
+ */
+ __kernel_gettimeofday;
+ __kernel_clock_gettime;
+ __kernel_clock_getres;
+
+ local: *;
+ };
+}
Index: quilt-2.6/arch/s390/kernel/vdso64/vdso64_wrapper.S
===================================================================
--- /dev/null
+++ quilt-2.6/arch/s390/kernel/vdso64/vdso64_wrapper.S
@@ -0,0 +1,13 @@
+#include <linux/init.h>
+#include <asm/page.h>
+
+ .section ".data.page_aligned"
+
+ .globl vdso64_start, vdso64_end
+ .balign PAGE_SIZE
+vdso64_start:
+ .incbin "arch/s390/kernel/vdso64/vdso64.so"
+ .balign PAGE_SIZE
+vdso64_end:
+
+ .previous
Index: quilt-2.6/arch/s390/kernel/vdso.c
===================================================================
--- /dev/null
+++ quilt-2.6/arch/s390/kernel/vdso.c
@@ -0,0 +1,232 @@
+/*
+ * vdso setup for s390
+ *
+ * Copyright IBM Corp. 2008
+ * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License (version 2 only)
+ * as published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/smp.h>
+#include <linux/stddef.h>
+#include <linux/unistd.h>
+#include <linux/slab.h>
+#include <linux/user.h>
+#include <linux/elf.h>
+#include <linux/security.h>
+#include <linux/bootmem.h>
+
+#include <asm/pgtable.h>
+#include <asm/system.h>
+#include <asm/processor.h>
+#include <asm/mmu.h>
+#include <asm/mmu_context.h>
+#include <asm/sections.h>
+#include <asm/vdso.h>
+
+/* Max supported size for symbol names */
+#define MAX_SYMNAME 64
+
+#if defined(CONFIG_32BIT) || defined(CONFIG_COMPAT)
+extern char vdso32_start, vdso32_end;
+static void *vdso32_kbase = &vdso32_start;
+static unsigned int vdso32_pages;
+static struct page **vdso32_pagelist;
+#endif
+
+#ifdef CONFIG_64BIT
+extern char vdso64_start, vdso64_end;
+static void *vdso64_kbase = &vdso64_start;
+static unsigned int vdso64_pages;
+static struct page **vdso64_pagelist;
+#endif /* CONFIG_64BIT */
+
+/*
+ * Should the kernel map a VDSO page into processes and pass its
+ * address down to glibc upon exec()?
+ */
+unsigned int __read_mostly vdso_enabled = 1;
+
+static int __init vdso_setup(char *s)
+{
+ vdso_enabled = simple_strtoul(s, NULL, 0);
+ return 1;
+}
+__setup("vdso=", vdso_setup);
+
+/*
+ * The vdso data page
+ */
+static union {
+ struct vdso_data data;
+ u8 page[PAGE_SIZE];
+} vdso_data_store __attribute__((__section__(".data.page_aligned")));
+struct vdso_data *vdso_data = &vdso_data_store.data;
+
+/*
+ * This is called from binfmt_elf, we create the special vma for the
+ * vDSO and insert it into the mm struct tree
+ */
+int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
+{
+ struct mm_struct *mm = current->mm;
+ struct page **vdso_pagelist;
+ unsigned long vdso_pages;
+ unsigned long vdso_base;
+ int rc;
+
+ /*
+ * Only map the vdso for dynamically linked elf binaries.
+ */
+ if (!uses_interp)
+ return 0;
+
+ vdso_base = mm->mmap_base;
+#ifdef CONFIG_64BIT
+ vdso_pagelist = vdso64_pagelist;
+ vdso_pages = vdso64_pages;
+#ifdef CONFIG_COMPAT
+ if (test_thread_flag(TIF_31BIT)) {
+ vdso_pagelist = vdso32_pagelist;
+ vdso_pages = vdso32_pages;
+ }
+#endif
+#else
+ vdso_pagelist = vdso32_pagelist;
+ vdso_pages = vdso32_pages;
+#endif
+
+ /*
+ * vDSO has a problem and was disabled, just don't "enable" it for
+ * the process
+ */
+ if (vdso_pages == 0)
+ return 0;
+
+ current->mm->context.vdso_base = 0;
+
+ /*
+ * pick a base address for the vDSO in process space. We try to put
+ * it at vdso_base which is the "natural" base for it, but we might
+ * fail and end up putting it elsewhere.
+ */
+ down_write(&mm->mmap_sem);
+ vdso_base = get_unmapped_area(NULL, vdso_base,
+ vdso_pages << PAGE_SHIFT, 0, 0);
+ if (IS_ERR_VALUE(vdso_base)) {
+ rc = vdso_base;
+ goto out_up;
+ }
+
+ /*
+ * our vma flags don't have VM_WRITE so by default, the process
+ * isn't allowed to write those pages.
+ * gdb can break that with ptrace interface, and thus trigger COW
+ * on those pages but it's then your responsibility to never do that
+ * on the "data" page of the vDSO or you'll stop getting kernel
+ * updates and your nice userland gettimeofday will be totally dead.
+ * It's fine to use that for setting breakpoints in the vDSO code
+ * pages though
+ *
+ * Make sure the vDSO gets into every core dump.
+ * Dumping its contents makes post-mortem fully interpretable later
+ * without matching up the same kernel and hardware config to see
+ * what PC values meant.
+ */
+ rc = install_special_mapping(mm, vdso_base, vdso_pages << PAGE_SHIFT,
+ VM_READ|VM_EXEC|
+ VM_MAYREAD|VM_MAYWRITE|VM_MAYEXEC|
+ VM_ALWAYSDUMP,
+ vdso_pagelist);
+ if (rc)
+ goto out_up;
+
+ /* Put vDSO base into mm struct */
+ current->mm->context.vdso_base = vdso_base;
+
+ up_write(&mm->mmap_sem);
+ return 0;
+
+out_up:
+ up_write(&mm->mmap_sem);
+ return rc;
+}
+
+const char *arch_vma_name(struct vm_area_struct *vma)
+{
+ if (vma->vm_mm && vma->vm_start == vma->vm_mm->context.vdso_base)
+ return "[vdso]";
+ return NULL;
+}
+
+static int __init vdso_init(void)
+{
+ int i;
+
+#if defined(CONFIG_32BIT) || defined(CONFIG_COMPAT)
+ /* Calculate the size of the 32 bit vDSO */
+ vdso32_pages = ((&vdso32_end - &vdso32_start
+ + PAGE_SIZE - 1) >> PAGE_SHIFT) + 1;
+
+ /* Make sure pages are in the correct state */
+ vdso32_pagelist = kzalloc(sizeof(struct page *) * (vdso32_pages + 1),
+ GFP_KERNEL);
+ BUG_ON(vdso32_pagelist == NULL);
+ for (i = 0; i < vdso32_pages - 1; i++) {
+ struct page *pg = virt_to_page(vdso32_kbase + i*PAGE_SIZE);
+ ClearPageReserved(pg);
+ get_page(pg);
+ vdso32_pagelist[i] = pg;
+ }
+ vdso32_pagelist[vdso32_pages - 1] = virt_to_page(vdso_data);
+ vdso32_pagelist[vdso32_pages] = NULL;
+#endif
+
+#ifdef CONFIG_64BIT
+ /* Calculate the size of the 64 bit vDSO */
+ vdso64_pages = ((&vdso64_end - &vdso64_start
+ + PAGE_SIZE - 1) >> PAGE_SHIFT) + 1;
+
+ /* Make sure pages are in the correct state */
+ vdso64_pagelist = kzalloc(sizeof(struct page *) * (vdso64_pages + 1),
+ GFP_KERNEL);
+ BUG_ON(vdso64_pagelist == NULL);
+ for (i = 0; i < vdso64_pages - 1; i++) {
+ struct page *pg = virt_to_page(vdso64_kbase + i*PAGE_SIZE);
+ ClearPageReserved(pg);
+ get_page(pg);
+ vdso64_pagelist[i] = pg;
+ }
+ vdso64_pagelist[vdso64_pages - 1] = virt_to_page(vdso_data);
+ vdso64_pagelist[vdso64_pages] = NULL;
+#endif /* CONFIG_64BIT */
+
+ get_page(virt_to_page(vdso_data));
+
+ smp_wmb();
+
+ return 0;
+}
+arch_initcall(vdso_init);
+
+int in_gate_area_no_task(unsigned long addr)
+{
+ return 0;
+}
+
+int in_gate_area(struct task_struct *task, unsigned long addr)
+{
+ return 0;
+}
+
+struct vm_area_struct *get_gate_vma(struct task_struct *tsk)
+{
+ return NULL;
+}
--
blue skies,
Martin.

"Reality continues to ruin my life." - Calvin.



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